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The diagonal relationship is due to similarity in ionic size and the ratio of:

ADensity to weight
BCharge to radius
CMass to volume
DProtons to neutrons
Answer & Solution
Correct answer: B. Charge to radius
1. Two properties of the ions are compared. 2. One is size and the other combines charge with size. 3. That is the charge to radius ratio. _Source: syllabus Chemistry Part II, Unit 10, The s-Block Elements._
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